GCN Circular 8087
K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team: We have analysed the first four orbits of the XRT data obtained for GRB 080810 (Page et al., GCN Circ. 8080). The first orbit (376 s) was taken entirely in Windowed Timing (WT) mode, followed by 2.8 of Photon Counting (PC) data. The UVOT-enhanced position was given by Evans et al. in GCN Circ. 8086. The WT data show a number of flares, with the strongest peaking around 107 and 209 s after the trigger; the first of these is also visible in the BAT data. The PC data in later orbits can be modelled with a single power-law decay, with alpha = 1.20 +0.12/-0.11. There is strong spectral evolution throughout the first orbit, as is typical for flaring activity. A spectrum extracted from the PC mode data (3.8-12.1 ks after the trigger) can be fitted with a power-law of Gamma = 1.98 +/- 0.06, absorbed by the Galactic column in this direction of 3.28x10^20 cm^-2. The observed (unabsorbed) flux over this time is 1.99 (2.20) x 10^-11 erg cm^-2 s^-1. If the decay continues with alpha = 1.2, the predicted count-rate at 24 hours is 0.02 count s^-1, corresponding to an observed (unabsorbed) flux of 8.5 (9.4) x 10^-13 erg cm^-2 s^-1. This is an official product of the Swift-XRT team.